pcf8563.c
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// SPDX-License-Identifier: GPL-2.0+
/*
* (C) Copyright 2001
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
/*
* Date & Time support for Philips PCF8563 RTC
*/
/* #define DEBUG */
#include <common.h>
#include <command.h>
#include <dm.h>
#include <rtc.h>
#include <i2c.h>
#if !CONFIG_IS_ENABLED(DM_RTC)
static uchar rtc_read (uchar reg);
static void rtc_write (uchar reg, uchar val);
/* ------------------------------------------------------------------------- */
int rtc_get (struct rtc_time *tmp)
{
int rel = 0;
uchar sec, min, hour, mday, wday, mon_cent, year;
sec = rtc_read (0x02);
min = rtc_read (0x03);
hour = rtc_read (0x04);
mday = rtc_read (0x05);
wday = rtc_read (0x06);
mon_cent= rtc_read (0x07);
year = rtc_read (0x08);
debug ( "Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x "
"hr: %02x min: %02x sec: %02x\n",
year, mon_cent, mday, wday,
hour, min, sec );
debug ( "Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
rtc_read (0x0C),
rtc_read (0x0B),
rtc_read (0x0A),
rtc_read (0x09) );
if (sec & 0x80) {
puts ("### Warning: RTC Low Voltage - date/time not reliable\n");
rel = -1;
}
tmp->tm_sec = bcd2bin (sec & 0x7F);
tmp->tm_min = bcd2bin (min & 0x7F);
tmp->tm_hour = bcd2bin (hour & 0x3F);
tmp->tm_mday = bcd2bin (mday & 0x3F);
tmp->tm_mon = bcd2bin (mon_cent & 0x1F);
tmp->tm_year = bcd2bin (year) + ((mon_cent & 0x80) ? 1900 : 2000);
tmp->tm_wday = bcd2bin (wday & 0x07);
tmp->tm_yday = 0;
tmp->tm_isdst= 0;
debug ( "Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
return rel;
}
int rtc_set (struct rtc_time *tmp)
{
uchar century;
debug ( "Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
rtc_write (0x08, bin2bcd(tmp->tm_year % 100));
century = (tmp->tm_year >= 2000) ? 0 : 0x80;
rtc_write (0x07, bin2bcd(tmp->tm_mon) | century);
rtc_write (0x06, bin2bcd(tmp->tm_wday));
rtc_write (0x05, bin2bcd(tmp->tm_mday));
rtc_write (0x04, bin2bcd(tmp->tm_hour));
rtc_write (0x03, bin2bcd(tmp->tm_min ));
rtc_write (0x02, bin2bcd(tmp->tm_sec ));
return 0;
}
void rtc_reset (void)
{
/* clear all control & status registers */
rtc_write (0x00, 0x00);
rtc_write (0x01, 0x00);
rtc_write (0x0D, 0x00);
/* clear Voltage Low bit */
rtc_write (0x02, rtc_read (0x02) & 0x7F);
/* reset all alarms */
rtc_write (0x09, 0x00);
rtc_write (0x0A, 0x00);
rtc_write (0x0B, 0x00);
rtc_write (0x0C, 0x00);
}
/* ------------------------------------------------------------------------- */
static uchar rtc_read (uchar reg)
{
return (i2c_reg_read (CONFIG_SYS_I2C_RTC_ADDR, reg));
}
static void rtc_write (uchar reg, uchar val)
{
i2c_reg_write (CONFIG_SYS_I2C_RTC_ADDR, reg, val);
}
#else
static int pcf8563_rtc_get(struct udevice *dev, struct rtc_time *tmp)
{
int rel = 0;
uchar sec, min, hour, mday, wday, mon_cent, year;
sec = dm_i2c_reg_read(dev, 0x02);
min = dm_i2c_reg_read(dev, 0x03);
hour = dm_i2c_reg_read(dev, 0x04);
mday = dm_i2c_reg_read(dev, 0x05);
wday = dm_i2c_reg_read(dev, 0x06);
mon_cent = dm_i2c_reg_read(dev, 0x07);
year = dm_i2c_reg_read(dev, 0x08);
debug("Get RTC year: %02x mon/cent: %02x mday: %02x wday: %02x ",
year, mon_cent, mday, wday);
debug("hr: %02x min: %02x sec: %02x\n",
hour, min, sec);
debug("Alarms: wday: %02x day: %02x hour: %02x min: %02x\n",
dm_i2c_reg_read(dev, 0x0C),
dm_i2c_reg_read(dev, 0x0B),
dm_i2c_reg_read(dev, 0x0A),
dm_i2c_reg_read(dev, 0x09));
if (sec & 0x80) {
puts("### Warning: RTC Low Voltage - date/time not reliable\n");
rel = -1;
}
tmp->tm_sec = bcd2bin(sec & 0x7F);
tmp->tm_min = bcd2bin(min & 0x7F);
tmp->tm_hour = bcd2bin(hour & 0x3F);
tmp->tm_mday = bcd2bin(mday & 0x3F);
tmp->tm_mon = bcd2bin(mon_cent & 0x1F);
tmp->tm_year = bcd2bin(year) + ((mon_cent & 0x80) ? 1900 : 2000);
tmp->tm_wday = bcd2bin(wday & 0x07);
tmp->tm_yday = 0;
tmp->tm_isdst = 0;
debug("Get DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
return rel;
}
static int pcf8563_rtc_set(struct udevice *dev, const struct rtc_time *tmp)
{
uchar century;
debug("Set DATE: %4d-%02d-%02d (wday=%d) TIME: %2d:%02d:%02d\n",
tmp->tm_year, tmp->tm_mon, tmp->tm_mday, tmp->tm_wday,
tmp->tm_hour, tmp->tm_min, tmp->tm_sec);
dm_i2c_reg_write(dev, 0x08, bin2bcd(tmp->tm_year % 100));
century = (tmp->tm_year >= 2000) ? 0 : 0x80;
dm_i2c_reg_write(dev, 0x07, bin2bcd(tmp->tm_mon) | century);
dm_i2c_reg_write(dev, 0x06, bin2bcd(tmp->tm_wday));
dm_i2c_reg_write(dev, 0x05, bin2bcd(tmp->tm_mday));
dm_i2c_reg_write(dev, 0x04, bin2bcd(tmp->tm_hour));
dm_i2c_reg_write(dev, 0x03, bin2bcd(tmp->tm_min));
dm_i2c_reg_write(dev, 0x02, bin2bcd(tmp->tm_sec));
return 0;
}
static int pcf8563_rtc_reset(struct udevice *dev)
{
/* clear all control & status registers */
dm_i2c_reg_write(dev, 0x00, 0x00);
dm_i2c_reg_write(dev, 0x01, 0x00);
dm_i2c_reg_write(dev, 0x0D, 0x00);
/* clear Voltage Low bit */
dm_i2c_reg_write(dev, 0x02, dm_i2c_reg_read(dev, 0x02) & 0x7F);
/* reset all alarms */
dm_i2c_reg_write(dev, 0x09, 0x00);
dm_i2c_reg_write(dev, 0x0A, 0x00);
dm_i2c_reg_write(dev, 0x0B, 0x00);
dm_i2c_reg_write(dev, 0x0C, 0x00);
return 0;
}
static const struct rtc_ops pcf8563_rtc_ops = {
.get = pcf8563_rtc_get,
.set = pcf8563_rtc_set,
.reset = pcf8563_rtc_reset,
};
static const struct udevice_id pcf8563_rtc_ids[] = {
{ .compatible = "nxp,pcf8563" },
{ }
};
U_BOOT_DRIVER(rtc_pcf8563) = {
.name = "rtc-pcf8563",
.id = UCLASS_RTC,
.of_match = pcf8563_rtc_ids,
.ops = &pcf8563_rtc_ops,
};
#endif